/*************************************************************************

  This code is from Dynamic Web Coding at www.dyn-web.com

  Copyright 2001-5 by Sharon Paine 

  See Terms of Use at www.dyn-web.com/bus/terms.html

  regarding conditions under which you may use this code.

  This notice must be retained in the code as is!

*************************************************************************/



/*

    pausing scroller - vertical or horizontal 

    version date: March 2005 (revised GeckoTableFix)

*/



// Arguments: id of content layer (inside wn), width and height of scroller (of wn, that is), 

// number of items (repeat 1st one at end!), axis ("v" or "h"),

// set up mouse events? (boolean)

function dw_scroller(id, w, h, num, axis, bMouse) {

    this.id=id; this.el = document.getElementById? document.getElementById(id): null; 

    if (!this.el) return; this.css = this.el.style; 

    this.css.left = this.x = 0; this.css.top = this.y = 0;

    this.w=w; this.h=h; this.num=num; this.axis=axis||"v"; 

    this.ctr=1; // pause onload (for large doc's, may want to set this to 1)

    this.pause=5000; this.speed=60; // defaults

    if (bMouse) dw_scrollers.setMouseEvents(this.el);

    this.lastTime = new Date().getTime(); this.check = 0;

    this.index = dw_scrollers.ar.length;  dw_scrollers.ar[this.index] = this;

    this.active = true;

}



dw_scroller.prototype.setTiming = function(speed, pause) {

    this.speed = speed; this.pause = pause;

}



dw_scroller.prototype.controlScroll = function() {

    if (this.ctr > this.num-1) {

        this.shiftTo(0, 0); this.ctr = 1;

    } else {

        switch (this.axis) {

            case "v" :

                if (this.y > -this.h * this.ctr) { 

                    var ny = this.y + -1 * this.elapsed/1000 * this.speed;

                    ny = Math.max(ny, -this.h * this.ctr);

                    this.shiftTo(0, ny);	

                } else this.doPause();

                break;

            case "h" :

                if (this.x > -this.w * this.ctr) { 

                    var nx = this.x + -1 * this.elapsed/1000 * this.speed;

                    nx = Math.max(nx, -this.w * this.ctr);

                    this.shiftTo(nx, 0);	

                } else this.doPause();

            break;

        }

    }

}



dw_scroller.prototype.doPause = function() {

    this.check += this.elapsed;

    if (this.check >= this.pause) { this.ctr++; this.check = 0; }

}



dw_scroller.prototype.shiftTo = function(x, y) {

    this.css.left = (this.x = x) + "px";

    this.css.top = (this.y = y) + "px";

}



////////////////////////////////////////////////////////////////////////////

// common to all scrollers (pausing or continuous, vertical or horizontal)

dw_scrollers = {};  

dw_scrollers.ar = []; // global access to all scroller instances



dw_scrollers.setMouseEvents = function(obj) {

    obj.onmouseover = dw_scrollers.halt;

    obj.onmouseout = dw_scrollers.resume;

}



dw_scrollers.halt = function() {

    var curObj;

    for (var i=0; curObj = dw_scrollers.ar[i]; i++) 

        if ( curObj.id == this.id ) { curObj.active = false; return; }

}



dw_scrollers.resume = function(e) {

    var curObj;

    for (var i=0; curObj = dw_scrollers.ar[i]; i++) {

        if ( curObj.id == this.id ) {

            e = e? e: window.event;

            var toEl = e.relatedTarget? e.relatedTarget: e.toElement;

            if ( this != toEl && !dw_contained(toEl, this) ) { 

                var now = new Date().getTime();

                curObj.elapsed = now - curObj.lastTime;

                curObj.lastTime = now; curObj.active = true; return; 

            }

        }

    }

}



// Handle all instances with one timer - idea from youngpup.net

dw_scrollers.timer = window.setInterval("dw_scrollers.control()", 10);

dw_scrollers.control = function() {

    var curObj;

    for (var i=0; curObj = dw_scrollers.ar[i]; i++) {

        if ( curObj.active ) {

            var now = new Date().getTime();

            curObj.elapsed = now - curObj.lastTime;

            curObj.lastTime = now; curObj.controlScroll();

        }

    }

}



// remove layers from table for ns6+/mozilla (needed for scrollers inside tables)

// pass id's of scrollers (i.e., div's that contain content that scrolls, usually wn, or wn1, ...)

dw_scrollers.GeckoTableFix = function() {

    var ua = navigator.userAgent;

    if ( ua.indexOf("Gecko") > -1 && ua.indexOf("Firefox") == -1 

        && ua.toLowerCase().indexOf("like gecko") == -1 ) {

        dw_scrollers.hold = []; // holds id's of wndo (i.e., 'the scroller') and its container

        for (var i=0; arguments[i]; i++) {

            var wndo = document.getElementById( arguments[i] );

            var holderId = wndo.parentNode.id;

            var holder = document.getElementById(holderId);

            document.body.appendChild( holder.removeChild(wndo) );

            wndo.style.zIndex = 1000;

            var pos = getPageOffsets(holder);

            wndo.style.left = pos.x + "px"; wndo.style.top = pos.y + "px";

            dw_scrollers.hold[i] = [ arguments[i], holderId ];

        }

        window.addEventListener("resize", dw_scrollers.rePosition, true);

    }

}



// ns6+/mozilla need to reposition layers onresize when scrollers inside tables.

dw_scrollers.rePosition = function() {

    if (dw_scrollers.hold) {

        for (var i=0; dw_scrollers.hold[i]; i++) {

            var wndo = document.getElementById( dw_scrollers.hold[i][0] );

            var holder = document.getElementById( dw_scrollers.hold[i][1] );

            var pos = getPageOffsets(holder);

            wndo.style.left = pos.x + "px"; wndo.style.top = pos.y + "px";

        }

    }

}



function getPageOffsets(el) {

    var left = el.offsetLeft;

    var top = el.offsetTop;

    if ( el.offsetParent && el.offsetParent.clientLeft || el.offsetParent.clientTop ) {

        left += el.offsetParent.clientLeft;

        top += el.offsetParent.clientTop;

    }

    while ( el = el.offsetParent ) {

        left += el.offsetLeft;

        top += el.offsetTop;

    }

    return { x:left, y:top };

}



// returns true if oNode is contained by oCont (container)

function dw_contained(oNode, oCont) {

  if (!oNode) return; // in case alt-tab away while hovering (prevent error)

  while ( oNode = oNode.parentNode ) if ( oNode == oCont ) return true;

  return false;

}



// avoid memory leak in ie

dw_scrollers.unHook = function() {

  var i, curObj;

  for (i=0; curObj = dw_scrollers.ar[i]; i++) {

    if ( curObj.el ) { 

      curObj.el.onmouseover = null;

      curObj.el.onmouseout = null;

      curObj.el = null;

    }

  }

}



if ( window.addEventListener ) window.addEventListener( "unload", dw_scrollers.unHook, true);

else if ( window.attachEvent ) window.attachEvent( "onunload", dw_scrollers.unHook );